Revive Windows arm64 build and testing

[saschanaz]

#14216 removed it, but the underlying problem has been fixed a few months ago.

[alex]

We are in an extended period of evaluation whether or not arm64 is stable enough (there were multiple regressions) for us to include -- you can follow #15350.

[saschanaz]

Oh, I only checked issue list. Maybe reopen this for other people doing the same?

[alex]

Fair enough.